The other seven are tiny (an analogy might be a sheet of paper, which is two-dimensional for practical purposes, even though it does have a finite thickness).
另外7维很微小(一个可以类比的例子是纸面，通常认为是2维的，虽然它还是有厚度的，所以还是3维的)。
By way of analogy, we might think of a two-dimensional bug living out his life in a plane.
打个比方，我们可以想象一个一生都在平面上度过的两维昆虫。
By using the impulsion flow analogy, the three dimensional, steady, separated flow problem is reduced to the two dimensional, unsteady, separated flow problem for solution.
文中采用冲击横流比拟概念，将绕旋成体的三维、定常、分离流问题转化为二维、非定常、分离流问题来求解。
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